//: io/LargeMappedFiles.java
// Creating a very large file using mapping.
// {RunByHand}
package io;

import java.nio.*;
import java.nio.channels.*;
import java.io.*;

import static net.mindview.util.Print.*;

public class LargeMappedFiles
{
    static int length = 0x8FFFFFF; // 128 MB
    
    public static void main(String[] args)
        throws Exception
    {
        MappedByteBuffer out =
            new RandomAccessFile("test.dat", "rw").getChannel().map(FileChannel.MapMode.READ_WRITE, 0, length);
        for (int i = 0; i < length; i++)
            out.put((byte)'x');
        print("Finished writing");
        for (int i = length / 2; i < length / 2 + 6; i++)
            printnb((char)out.get(i));
    }
} /// :~
